File size different in Bridge CS3 and Photoshop

I'm using PS CS3 and Bridge CS3 on a Macbook Pro. I have about 40 files that are about 50MB when opened in PS. In Bridge, under the thumbnails, the file size is pretty close to that, sometimes the exact amount, sometimes off by a couple/few MBs. I've been told this is due to some compression "on the disk" by Bridge. All the files are PSDs, by the way, and they are all flattened.
What I don't understand is why just a *few* files that are 50MB in PS are showing up MUCH smaller in Bridge; e.g., 36MB. If it's due to compression, why would Bridge compress just a few files so much?
I'm wondering if this has to do with the cached thumbnails, and maybe the thumbnails aren't showing the latest version (with accurate size) of the file. I don't know much about the cache, and I'm afraid to "purge the cache" without knowing anything about it. Also, if it has to do with preferences, I'm don't really know about that, either.

Bridge does not compress any files whatsoever. Bridge is not an image editor, it's nothing but a browser that hands the files to their respective applications. Bridge does not "open" or "save" files, it can't compress them in any shape or form.
What you are seeing is the difference between the opened, uncompressed file in RAM and the space the file occupies on disk once
Photoshop has saved and compressed it.
The Bridge cache has nothing to do with any of this.

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    To : [email protected]
    Subject :  i have dell xps it runs at 3840 x 2167 and bridge lightroom and photoshop are unusable as the type is so small if win is re scaled to a low res the products still use full res and you canot see text can you help!
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